Thorn Lighting Ltd.

Hameed Al-Attar

Andrew Monkman

In a multilayer organic device () comprising a substrate bearing an anode () and a cathode (), wherein located between the anode () and the cathode () is at least a first layer () comprising a first organic semiconductor material; and a second layer () over the first layer () comprising a second organic semiconductor material; the first organic semiconductor material is a polymer and the second organic material is a polymer or an oligomer, the average molecular weight of the first organic semiconductor material being higher than the average molecular weight of the second organic semiconductor material.

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Durham, United Kingdom

Hameed Al-Attar